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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.nereids.rules.rewrite;

import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.trees.plans.Plan;

import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * EliminateSortUnderApply.
 */
public class EliminateSortUnderApply implements RewriteRuleFactory {
    @Override
    public List<Rule> buildRules() {
        return ImmutableList.of(
            RuleType.ELIMINATE_SORT_UNDER_APPLY.build(
                logicalApply(any(), logicalSort()).then(apply -> {
                    List<Plan> children = new ImmutableList.Builder<Plan>()
                            .add(apply.left())
                            .add(apply.right().child())
                            .build();
                    return apply.withChildren(children);
                })
            ),
            RuleType.ELIMINATE_SORT_UNDER_APPLY_PROJECT.build(
                logicalApply(any(), logicalProject(logicalSort())).then(apply -> {
                    List<Plan> children = new ImmutableList.Builder<Plan>()
                            .add(apply.left())
                            .add(apply.right().withChildren(apply.right().child().child()))
                            .build();
                    return apply.withChildren(children);
                })
            )
        );
    }
}
